I've been playing around with Nexter for couple days to see how powerful it is and love the idea of "all-in-one" concept that Posimyth team brings, but I still have crucial notes for Nexter. For context, I've used a bunch of page builders, so I'll be comparing Nexter to others as well.

What I liked most:
It has tons of template for faster development. Great for inspiration or direct use. Another thing is Nexter's ecosystem has everything that we need. From page builder (with blocks), theme, security, admin enhancement, etc. White-label feature also comes in handy for freelancers and agencies. From their block collection, we almost don't need anything else.

What I didn't like:
It has multiple installations for each plugin (eg. Blocks and Blocks Pro, Extension and Extensions Pro). It kinda defeat the "plugin efficiency" even though the numbers of installations are still low if we compared to the other plugins to reach similar features. As I mentioned earlier, their block library is very extensive, but I feel some blocks are redundant. For instance, there are currently four different blocks related to typography and three buttons. I'm aware they have different purposes, but other plugins can simplify the functions and I hope the same for Nexter. With all the massive features, there's no global styling for blocks (as in the native Site Editor) and no way to save customized settings.

Neutral opinion:
However, I believe it's suitable for anyone familiar with a page builder. In my opinion, the style editor and its workflow is more closer to a page builder than Gutenberg, which takes a different approach.

Notes to the team:
There's room for improvements. While it's great to see many documentation and videos, I think it's also important to have "how to set up" videos since it has so many features. Many content in documentation don't include final-result screenshots, so users like me may sometimes be unsure whether they've done things correctly.

Overall, it's more than enough to build nice websites, especially with this price. It offers great tools for freelancers or agencies as they have solid bundle that consists of theme, blocks (builder), and extension to enhance theme customization. If you're looking for a tool to replace page builder completely or ready to fully convert into a complete ecosystem, Nexter is the answer. But on the other hand, if you are a Block Editor user, it has a significant learning curve compared to others.